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[PD] doc: Document SGLANG_MOONCAKE_CUSTOM_MEM_POOL and supported values #18259

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ShangmingCai merged 4 commits into from
Feb 5, 2026
Merged

[PD] doc: Document SGLANG_MOONCAKE_CUSTOM_MEM_POOL and supported values #18259

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[PD] doc: Document SGLANG_MOONCAKE_CUSTOM_MEM_POOL and supported values
stmatengss Feb 4, 2026
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Update docs/advanced_features/pd_disaggregation.md
ShangmingCai Feb 5, 2026
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Update docs/references/environment_variables.md
ShangmingCai Feb 5, 2026
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ShangmingCai Feb 5, 2026
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4 changes: 3 additions & 1 deletion docs/advanced_features/pd_disaggregation.md
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Expand Up @@ -130,10 +130,12 @@ PD Disaggregation with Mooncake supports the following environment variables for
To enable NVLink transport for KV cache transfers with the mooncake backend (recommended for NVL72 deployments), set the following environment variables. Note that auxiliary data transfer will still use TCP as a temporary workaround.

```bash
export SGLANG_MOONCAKE_CUSTOM_MEM_POOL=True
export SGLANG_MOONCAKE_CUSTOM_MEM_POOL=NVLINK
export MC_FORCE_MNNVL=True
```

The `SGLANG_MOONCAKE_CUSTOM_MEM_POOL` environment variable enables the custom memory pool. Supported values are `NVLINK` (or `True`), `BAREX`, and `INTRA_NODE_NVLINK`.

#### Prefill Server Configuration
| Variable | Description | Default |
|:--------:|:-----------:|:--------:
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1 change: 1 addition & 0 deletions docs/references/environment_variables.md
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Expand Up @@ -98,6 +98,7 @@ SGLang supports various environment variables that can be used to configure its
| `SGLANG_CLIP_MAX_NEW_TOKENS_ESTIMATION` | Clip max new tokens estimation for memory planning | `4096` |
| `SGLANG_DETOKENIZER_MAX_STATES` | Maximum states for detokenizer | Default value based on system |
| `SGLANG_ENABLE_TP_MEMORY_INBALANCE_CHECK` | Enable checks for memory imbalance across Tensor Parallel ranks | `true` |
| `SGLANG_MOONCAKE_CUSTOM_MEM_POOL` | Configure the custom memory pool type for Mooncake. Supports `NVLINK`, `BAREX`, `INTRA_NODE_NVLINK`. If set to `true`, it defaults to `NVLINK`. | `None` |

## Model-Specific Options

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